Re: TTFB, Apache, Seaside Performance Problem

The problem is solved: I had to replace localhost by 127.0.0.1
Thanks a lot Norbert Hartl for your advice!

2017-01-05 12:25 GMT+01:00 Sabine Manaa [via Smalltalk] <
[email protected]>:

> Hi,
>
> I need the help of the community.
>
> I am not succeding in making our app faster.
> The problem is the Time to first Byte (TTFB). It is always more than one
> second which is much to much.
> We reduced the problem to a problem between apache and pharo/seaside.
>
> For this, I have a test application which only renders "hello World". So I
> am sure it is not my code, my database, my css, my js, my ssl.... :-)
>
> I optimized and learned a lot for my app, but it did not solve the TTFB
> problem, which costs 1 additional sec for each click of the user which is
> inaceptable.
>
> Please follow this tests to see the problem:
>
> ===>>> Test 1: test.html without Pharo/seaside
> https://tools.keycdn.com/performance?url=http://app.
> spesenfuchs.de/test.html
> TTFB in Frankfurt below 10 ms -> this proves that the server and
> configuration is fast.
>
> ===>>> Test 2: hello world, simple seaside page
> https://tools.keycdn.com/performance?url=app.spesenfuchs.de/hello
> TTFB in Frankfurt more than 1 second! -> this proves that it is not my
> application :-) it is only a hello world seaside page...
>
> ===>>> Test 3: my login page
> https://tools.keycdn.com/performance?url=app.spesenfuchs.de/rka
> TTFB in Frankfurt more than 1 second!
>
> (alternative: enter the urls into https://gtmetrix.com/)
>
> In Apache, we enabled tracing of the rewrite and this tells me (i assume),
> that apache makes the rewrite very fast, within the same millisecond :-)
> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace2] [pid 1288:tid 1692]
> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] init
> rewrite engine with requested uri /hello
> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace3] [pid 1288:tid 1692]
> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] applying
> pattern '^/rka(.*)$' to uri '/hello'
> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace3] [pid 1288:tid 1692]
> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] applying
> pattern '^/hello(.*)$' to uri '/hello'
> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace2] [pid 1288:tid 1692]
> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] rewrite
> '/hello' -> 'http://localhost:8085/HelloWorld/'
> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace2] [pid 1288:tid 1692]
> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] forcing
> proxy-throughput with http://localhost:8085/HelloWorld/
> [Thu Jan 05 12:14:35.243400 2017] [rewrite:trace1] [pid 1288:tid 1692]
> mod_rewrite.c(477): [client 91.89.219.232:52272] 91.89.219.232 - - [
> app.spesenfuchs.de/sid#66c848][rid#20bc4c8/initial
> <http://app.spesenfuchs.de/sid#66c848][rid%2320bc4c8/initial>] go-ahead
> with proxy request proxy:http://localhost:8085/HelloWorld/ [OK]
>
> So, I assume that there is problem between Apache and Seaside....
>
> My questiond are:
> what can I do to find the bottleneck?
> what is the reason that is so slow?
> your help is very appreciated because I have run out of ideas what it
> could be and I was investigating it several days now.
>
> Concerning the system:
> The server is at Amazon ec2 windows Server 2009 R2 SP1
> The Apache version is 2.4.23
> The configuration of the apache is like this (as described in the seaside
> book http://book.seaside.st/book/advanced/deployment/
> deployment-apache/configure-apache)
>
> <VirtualHost *:80>
>       ProxyPreserveHost On
>       ServerName app.spesenfuchs.de
>       RewriteEngine On
> <Directory "C:\xampp\htdocs">
>         Require all granted
> </Directory>
>      DocumentRoot "C:\xampp\htdocs"
>      RewriteCond %{DOCUMENT_ROOT}/%{REQUEST_FILENAME} !-f
>
>     RewriteRule ^/rka(.*)$ http://localhost:8085/RKA/$1 [proxy,last]
>    RewriteRule ^/hello(.*)$ http://localhost:8085/HelloWorld/$1 [proxy,last]
>
> </VirtualHost>
>
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